Since I have an extra PBass I decided to give it a shot, I havr had 5 and 6 strings in the past but always sold them and stayed with fours. Simple to do I have a tiny file set from Harbor Freight and took my time and filed the nut and the E and A string holes on the bridge. Oh I used an old Yamaha BB300. I probably went a little nuts and went too heavy on the string gauges but I figured it is only a 34 inch scale bass. I used the Daddario heavy gauge 110 set for the bottom three strings and a single 145 guage for the Low B. I was hoping to keep the tension close. Anyway really cool to have a low B in the arsenal, and keep the feel of a four banger. I may experiment with using a capo for C, D, E changes on the fly.